Oral-B 3754 - User Manual

Questions and Answers

M
michaelcharlesAug 9, 2025
Why is my Oral-B Electric Toothbrush handle not charging?
- J
  John CookAug 10, 2025
  Your Oral-B Electric Toothbrush handle might not be charging because the battery is at a very low level, and it may take 10-15 minutes until the display turns on. Also, the ambient temperature might be out of the valid range (less than 0°C or greater than 40°C), or the charger may not be properly connected. To resolve this, charge the handle for at least 30 minutes. It is recommended that the ambient temperature for charging is 5°C to 35°C. Also, ensure the charger is connected to the mains voltage.
T
teresapopeAug 19, 2025
Why does my Oral-B Electric Toothbrush make rattling/loud noise during brushing or turning on?
- J
  Jay SimmonsAug 20, 2025
  The rattling or loud noise during brushing or turning on your Oral-B Electric Toothbrush may be due to the brush head not being placed correctly onto the brush handle, or the brush head may be worn. Check that the brush head fits properly on the handle, noting that a small gap remains in between. If the brush head is worn, replace it.
D
Danielle GreenAug 30, 2025
What to do if my Oral-B 3754 Electric Toothbrush handle is not operating during first use?
- J
  Joshua StoneAug 30, 2025
  If your Oral-B Electric Toothbrush handle is not operating during the first use, it could be due to a very low battery charge or operating outside the standard temperature range. If the battery has a very low charge, charge it for at least 30 minutes. Always operate the toothbrush in standard operating temperatures (greater than 0°C and less than 40°C).

Summary

Important Safety Guidelines

Product Integrity and Damage Check

Critical Warnings and Precautions

Liquid Exposure Hazards

Do not place charger, plug, or case in water or liquid to prevent shock.

Cord Handling Safety

Battery and Device Safety

Electrical Safety During Unplugging

Initial Setup and First Use

Initial Toothbrush Setup

Charging and Operating Instructions

Battery Charging Procedure

Place handle on charger; check charge level on display. Full charge takes approx. 3 hours.

Low Battery and Motor Performance

Operating Your Oral-B iO Toothbrush

Starting Your Brushing Session

Attach brush head, wake handle, wet head, apply toothpaste, guide to teeth before activating.

Brushing Technique and Gum Care

Guide brush head systematically; consult dentist for technique. Expect minor gum bleeding initially.

Timer Functionality and Feedback

Timer signals quadrant changes and 2-minute brushing completion.

Smart Pressure Sensor Operation

Sensor uses light colors to indicate pressure; reduces speed under high pressure.

Understanding Brushing Modes

Details different modes like Daily Clean, Sensitive, Gum Care, Whiten, Intense, Super Sensitive, Tongue Clean.

Setting and Customizing Brushing Modes

Interactive Display Features

Oral-B iO Brush Head Information

iO Brush Head Selection and Replacement

Use specific iO heads; INDICATOR bristles signal need for replacement every ~3 months.

Connecting to Your Smartphone via Bluetooth

App Download and Bluetooth Pairing

Download Oral-B App; follow instructions to pair handle via Bluetooth for full functionality.

Smartphone Compatibility and App Use

Cleaning and Maintenance Procedures

Product Guarantee and Warranty Information

Warranty Coverage and Exclusions

Troubleshooting Common Problems

Oral-B App Connectivity Problems

Performing a Factory Reset

Toothbrush Operational Faults

Addresses handle not operating, low battery, temperature errors, and timer issues.

Charging and Noise Troubleshooting

Resolves issues like handle not charging, incorrect ambient temperature, and operational noise.

Oral-B 3754 Specifications

General

Model	3754
Timer	Yes
Power Source	Rechargeable battery
Modes	Daily Clean
Timer Intervals	2 minutes
Battery Type	NiMH
Included Accessories	Charger, 1 Brush Head
Warranty	2 years
Cleaning Type	Oscillating